In Hundred Books and Notes on Books, Qi Gong put forward unique opinions and opinions on many problems in the history of calligraphy. His talk about calligraphy has never puzzled me. He talked about the problems encountered in calligraphy learning, which always made people suddenly enlightened. 1985, China Pen Calligraphy Magazine was founded, with the inscription: "No matter whether the pen is steel wool, the wrist has no height. Painting is like chaos and body is like a cliff. " A few words have explained the most fundamental problem, that is, pen and brush are just different tools, but the principle of writing with pen is the same. Originally, it was good to use a brush or a hard pen, which was consistent in aesthetic principle. The difference between the two can be said to be completely caused by different tools (as is the ceramic seal that has become popular in recent years). Reading Qigong's calligraphy can better understand what he said. This work is mainly based on running script, occasionally using cursive calligraphy, stippling and painting, and the words are freely placed. It can be said that "there is a thing, there must be a reason." According to the theory of Qigong, "the trajectory is accurate, the pen is rational, and the viewer often feels its strength, not its real use of brawn".